Radiation doses to subjects in four clinical CT scanning modes and spatial distribution of chest scanning radiation field
10.13491/j.issn.1004-714X.2022.04.010
- VernacularTitle:探究4种临床CT扫描方式对受检者辐射剂量的影响及胸部扫描辐射场的空间分布
- Author:
Zhixin ZHAO
1
;
Haihua WANG
1
;
Qian QIAN
1
;
Qiang WANG
1
;
Luting YANG
1
;
Liyan JING
1
;
Bo ZHU
1
;
Yong YANG
1
;
Hezheng ZHAI
2
Author Information
1. Department of Occupational Health and Radiation Hygiene, Hangzhou Hospital for the Prevention and Treatment of Occupational Disease, Hangzhou 310014 China.
2. Institute of Radiation Medicine, Chinese Academy of Medical Sciences, Tianjin 300192 China.
- Publication Type:OriginalArticles
- Keywords:
CT;
Scanning mode;
Subject;
Space radiation field
- From:
Chinese Journal of Radiological Health
2022;31(4):437-442
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the absorbed dose to the common tissues of subjects in four clinical CT scanning modes and the spatial distribution of the radiation field in chest scanning, in order to provide a basis for the radiation protection of subjects and the space in the machine room. Methods A thermoluminescence detector (TLD) was used to measure the absorbed doses to the eye lens, thyroid gland, gonad, chest and abdominal skins of the anthropomorphic phantom in four CT scanning modes. The TLD was used to monitor the air kerma at different positions from the CT diagnostic table during chest spiral scanning. Results The absorbed doses to the eye lens, thyroid gland, gonad, chest and abdominal skins of the anthropomorphic phantom in four CT scanning modes were 0.040-64.818 mGy, 0.154-10.155 mGy, 0.028-0.154 mGy, 0.443-17.141 mGy, and 0.093-14.346 mGy, respectively. The maximum air kerma value of the space radiation field during chest scanning was 0.049 mGy, and the farther the distance from the CT tube, the smaller the value. Conclusion The absorbed doses to the common tissues of subjects examined by the four CT scanning modes generally do not exceed the threshold doses. The dose received by the companion of the subject during a single chest CT scan was small. In order to minimize radiation hazards, shielding measures can be taken in CT scanning to reduce the absorbed doses to the tissues of the subject, and the companion of the subject should appropriately increase the distance from the tube and the diagnostic table.
